code: def _apply(self):
      if self._current_colors is None or self._renderer is None:
          return
      self._renderer._set_mesh_scalars(
          mesh=self._polydata,
          scalars=self._current_colors,
          name=self._default_scalars_name,
      )
  
file_path: mne-python/mne/viz/_3d_overlay.py
imports: from collections import OrderedDict
  import numpy
  from ..utils import logger
label_desc: Use image node_id 7 for calling the _LayeredMesh obj's underlying member method code with example usage: obj._apply() without return types